.custom-combobox {
   position: relative;
   display: inline-block;
   width: 93%;
}
.custom-combobox-toggle {
   position: absolute;
   top: 0;
   bottom: 0;
   margin-left: -1px;
   padding: 0;
}
.custom-combobox-input {
   margin: 0;
   padding: 5px 10px;
}